Method and device for producing crimped multifilament synthetic yarn

Abstract

A method for producing at least one crimped multifilament synthetic yarn through the use of a texturing process, wherein a stream of heated gaseous medium is brought into a texturing channel (1), (2), (3), wherein synthetic filaments (4), (5), (6) are displaced and deformed by the heated gaseous medium in the texturing channel (1), (2), (3), wherein both the temperature and the flow rate of the gaseous medium are measured, and wherein the heat flow is regulated. To this end, the device comprises a regulating device (50) and, for each texturing channel (1), (2), (3), at least one temperature sensor (60), (61), (62) and a flow sensor (57), (58), (59).

The invention claimed is: 
     
       1. Method for producing at least one crimped multifilament synthetic yarn through the use of a texturing process, comprising:
 bringing a stream of heated gaseous medium into a texturing channel, 
 displacing and deforming a number of synthetic filaments by the heated gaseous medium in the texturing channel, 
 and fixing the deformed filaments, so that a crimped synthetic yarn is obtained, 
 wherein both temperature and flow rate of the gaseous medium are measured, and a heat supply per unit of time that results by introduction of the gaseous medium is regulated to achieve or maintain a predetermined target value for the heat supply by adjustment or regulation of at least one parameter which influences the heat supply. 
 
     
     
       2. Method for producing at least one crimped multifilament synthetic yarn, according to  claim 1 , characterized in that, in the regulation of the heat supply per unit of time, the heat supply is changed by changing or regulating the flow rate of the gaseous medium and/or the temperature of the heated gaseous medium. 
     
     
       3. Method for producing at least one crimped multifilament synthetic yarn, according to  claim 1 , characterized in that the heat supply per unit of time is regulated by regulating the flow rate of the stream of gaseous medium in order to attain a specific target value when a variance between the measured value and the target value is established, and/or by regulating the temperature of the stream of heated gaseous medium in order to attain a specific target value when a variance between the measured value and the target value is established. 
     
     
       4. Method for producing at least one crimped multifilament synthetic yarn, according to  claim 3 , characterized in that in the texturing process either only the flow rate of the stream of gaseous medium is regulated in order to attain a specific target value, wherein this target value is defined such that the stream of gaseous medium, at a flow rate with this target value and at the measured temperature, delivers a desired heat supply per unit of time, or only the temperature of the stream of heated gaseous medium is regulated in order to attain a specific target value, wherein this target value is defined such that the stream of gaseous medium, at a temperature with this target value and at the measured flow rate, delivers a desired heat supply per unit of time. 
     
     
       5. Method for producing at least one crimped multifilament synthetic yarn, according to  claim 1 , characterized in that the flow rate is regulated in order to attain a specific target value for the flow rate, and in that the flow rate is changed by changing or regulating pressure on the supplied gaseous medium. 
     
     
       6. Method according to  claim 1 , characterized in that the synthetic filaments in the texturing channel are compressed, so that a respective yarn plug is formed, and in that the yarn plugs, after having left the texturing channel, are displaced onto a moving cooling surface. 
     
     
       7. Method for producing at least one crimped multifilament synthetic yarn, according to  claim 1 , characterized in that the synthetic filaments in the texturing channel are compressed, so that a respective yarn plug is formed, wherein the compressed yarn is added at one end of the yarn plug, whilst at the other end of the yarn plug, being the take-off end, the compressed yarn is drawn off, so that the yarn plug unravels and the yarn is removed in the crimped state, in that the location of the take-off end of the yarn plug is detected, and in that in the texturing process one or more parameters are regulated on the basis of the detected location in order to prevent the locations of the take-off ends of the yarn plugs being outside a predefined take-off zone. 
     
     
       8. Method for producing at least one crimped multifilament synthetic yarn, according to  claim 1 , characterized in that at least two crimped multifilament yarns are produced simultaneously through the use of a respective texturing process, wherein in each texturing process a number of synthetic filaments are brought by a respective stream of heated gaseous medium into a respective texturing channel, in that both the temperature and the flow rate of each stream of gaseous medium are measured, and in that for each texturing channel the heat supply per unit of time that is realized by the introduction of the heated gaseous medium is regulated in order to minimize the differences between the heat supply in the different texturing channels. 
     
     
       9. Method for producing at least one crimped multifilament synthetic yarn, according to  claim 8 , characterized in that the heat supply per unit of time in the different texturing channels is regulated in order to attain or maintain a common target value. 
     
     
       10. Method for producing at least one crimped multifilament synthetic yarn, according to  claim 8 , characterized in that the heat supply per unit of time in each texturing channel is regulated by regulating the flow rate of the stream of gaseous medium in order to attain a specific target value and by regulating the temperature of the stream of heated gaseous medium in order to attain a specific target value, and in that for the different texturing channels the same target values are used. 
     
     
       11. Method for producing at least one crimped multifilament synthetic yarn, according to  claim 8 , characterized in that for each texturing channel the following parameters are measured:
 the pressure of the stream of gaseous medium, 
 the flow rate of the stream of gaseous medium, and 
 the temperature of the stream of heated gaseous medium, 
 and in that at least the pressure and/or the temperature are regulated in order to obtain a desired heat supply per unit of time in each texturing channel. 
 
     
     
       12. Method for producing at least one crimped multifilament synthetic yarn, according to  claim 8 , characterized in that the synthetic filaments in each texturing channel are compressed, so that a respective yarn plug is formed, wherein the compressed yarn is added at one end of the yarn plug, whilst at the other end of the yarn plug, being the take-off end, the compressed yarn is drawn off, so that the yarn plug unravels and the yarn is removed in the crimped state, in that the locations of the take-off ends of the different yarn plugs are detected, in that in each texturing process one or more parameters are regulated on the basis of the detected location in order to prevent the distance between farthest apart locations from exceeding a predefined maximum, or to prevent the locations of the take-off ends of the yarn plugs being outside a predefined take-off zone. 
     
     
       13. Method for producing at least one crimped multifilament synthetic yarn, according to  claim 12 , characterized in that in each texturing process at least one of the following parameters is regulated on the basis of the detected location of the take-off end of the yarn plug formed in that texturing process: the temperature, the flow rate and the pressure of the gaseous medium. 
     
     
       14. Method for producing at least one crimped multifilament synthetic yarn, according to  claim 12 , characterized in that the detection of the locations of the take-off ends is effected by a capacitive detection or by, during each texturing process, making image recordings on which the take-off ends of the different yarn groups are visible, wherein each detection of the locations of the take-off ends is effected by automatic analysis and/or processing of one or more image recordings. 
     
     
       15. Method according to  claim 12 , characterized in that the locations of the take-off ends of the different yarn plugs are detected at at least two successive points in time, in that, on the basis of established changes in these locations, for each take-off end is defined what location is expected at a later point in time, and in that regulators are provided to anticipate an expected location outside the predefined take-off zone by, in the particular texturing process, regulating a parameter in order to keep the take-off end within this take-off zone. 
     
     
       16. Method for producing at least one crimped multifilament synthetic yarn, according to  claim 1 , further comprising:
 measuring temperature and flow rate of the gaseous medium as the gaseous medium exits the texturing channel. 
 
     
     
       17. Method for producing at least one crimped multifilament synthetic yarn, according to  claim 16 , characterized in that the heat supply is defined based on the temperature and the flow rate of the gaseous medium, and the temperature and the flow rate of the gaseous medium as the gaseous medium exits the texturing channel. 
     
     
       18. Method for producing at least one crimped multifilament synthetic yarn through the use of a texturing process, comprising:
 bringing a stream of heated gaseous medium into a texturing channel; 
 measuring both temperature and flow rate of the gaseous medium; 
 regulating a heat supply per unit of time that depends on both the temperature and the flow rate of the gaseous medium, the regulating comprising determining a target value for the heat supply and, based on the measured temperature and the measured flow rate, adjusting or regulating at least one of the temperature and the flow rate so as to achieve or maintain the target value; 
 displacing and deforming a number of synthetic filaments by the heated gaseous medium in the texturing channel; and 
 fixing the deformed filaments, so that a crimped synthetic yarn is obtained.